Fresh-air inlet.



E. B. HENRY.

FRESH AIB. INLET. Anmouxo'n FILED un. 1a. 1909.

938,145. Patented oct. 26,1909;A

UNITED STATES PATENT OFFICE.

EUGENE B. HENRY, 0E SAN FRANCISCO, CALIFORNIA.

EREsI-I-AIR INLET.

Application filed April 19, 1909.

To all whom 'it may concern:

Be it known that I, EUGENE B. HENRY, citizen of the United States, residing in the city and county of San Francisco and State of California, have invented new and useful Improvements in Fresh-Air Inlets, of which the following is a specification.

My, invention relates to fresh-air inlet pipes that are used in plumbing operations, and particularly pertains to that class employed in admitting fresh air to the house side of the underground main drain trap in a plumbing system.

-It is the object of my invention to provide a fresh-air inlet fitting that is so constructed as to prevent sticks and the like from passing through the inlet and falling into the main drain trap, and which can be readily opened to remove any obstructions that may collect in the trap.

It is a further obj ect to provide a fresh-air inlet fitting that can be set flush with the surface of a sidewalk, floor or the like.

My invention consists of the parts and the construction and combination of parts as hereinafter more fully described and claimed, reference being had to the accompanying drawings, in which- Figure l is a vertical section showing the invention as applied. Fig. 2 is a detailed perspective view of the invent-ion with a portion broken away.

In constructing and installing housedrainage systems, it is necessary, to provide a main drain trap at the point of connection between the house drain and the sewer. This trap is usually located underground and at some distance from the building, and has a vent or fresh-air pipe leading from the house side of the trap to the surface of the ground, where it is open to the atmosphere in order to admit fresh air to create a circulation through the entire plumbing system in the building. Various means have been employed to cover the open end of the air inlet pipe in such manner as to revent the ingress of rubbish or the displacement of cover, and at the same time admit fresh air to the trap. The devices generally used are inadequate and possess many objectionable features. In t-he invention hereafter described I have obtained a fresh-air inlet that is efHcient, economical, and simple in construction.

In the drawings, A is an underground main drain trap of ordinary construction,

Speccation of Letters Patent.

'Patented oct. 26, 1909.

serial N0.-49o,906.

connecting the house drainage pipe 2 with the sewer pipe 3. A fresh-air inlet pipe l extends from the trap A upward to a point near the surface of the ground. Fitted into the upper end of the fresh-air pipe 4 is a tubular fitting 5 and a cover 6.

The member 5 is flared outward, at 7, and then continued upward in cylindrical form, as shown at 8, and is capped by the cover G. The cover 6 is provided with a number of openings or perforations 9, and has an annular side flange l0 which is adapted to fit free over the top of the enlarged portion 8. Secured to the inner side of the cover 6 is a bell-shaped or conical casting 1l, the mouth of which is approximately of the same diameter as, or even a little larger than, the inside of the fitting 5. Vhen the cover is in position, the lower edge of the bell 1l is suspended a short dist-ance above and directly over the throat of the pipe 4. A bead l2 is formed on the lower rim of the cover 6 to prevent the lifting of the cover when embedded in cement 13.

In practice, the invention is applied to the fresh-air inlet pipe, as shown in Fig. l. Air passes through the openings 9 and between the edge of the bell 11 and the flared walls 7, as indicated by the arrows.

It is obvious that sticks or the like which might be thrust through the openings 9 are prevented from passing directly into the fresh-air pipe 4, because the upper surface of the cone l1 and the annular incline 7 offer complete obstruction thereto. The cone ll is far enough above the incline 7 to permit such dirt as may fall through the openings 9 to pass down into the t-rap. Such materials as can pass through the openings 9 into the trap A will be of such size that they will be readily siphoned into the sewer. The main difiiculty heretofore has been to keep the openings in the cap from being plugged up by sticks poked in by small boys, and the cover from being lost off.- Practice shows that this difliculty is practically obviated in the present construction.

Having thus described my invention, what I claim and desire to secure by Letters Patent is- An improved air vent comprising a pipe section having its upper end fiared outwardly and then continued upwardly in cylindrical form, a cap of greater diameter than the enlarged cylindrical portion of said section, said cap having a downwardly extendalong the outer sides of Said cylindrical portion, said flange having a rim bead embedded in cement, and having perforat-ions permanent-ly opened to the atmosphere, and a removable, upwardly projecting conical baffle Secured to the underside of the cap and proj eeting within said cylindrical portion of the pipe section, the lower edge of said cone being proximate to but out of Contact with said flared port-ion of the pipe section, and

of a diameter Substantially the same as the diameter of said section below Said ared portion. Y

In testimony whereof I have hereunto set 1 5 my hand in presence of two subscribing wit# nesses. f

EUGENE B. HENRY. 

